You will have to do something with the bolt holes in the LA intake manifold that hold it to the heads, the bolts in the heads are in the same location, but at a different angle then they are in the LA heads.

I have to wonder if the port injection is part of the HP bump for the Magnum, though the heads are suppose to be much better. I would think the Magnum would run on the OBDI, might have to use all the LA sensors. Gene